CVE-2026-28737: Gitea 3D file viewer allows stored XSS through glTF extensionsRequired

Severity: high (CVSS 8.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-79

Description

Gitea versions from 1.25.0 before 1.26.0 allow stored cross-site scripting through the extensionsRequired field in glTF files rendered by the 3D file viewer.

Affected products

Gitea Open Source Git Server: from 1.25.0 before 1.26.0 — fixed in 1.26.0

How to fix

Upgrade to a fixed version: Gitea Open Source Git Server 1.26.0. Check the vendor advisory for mitigations.

References

https://blog.gitea.com/release-of-1.26.0/
https://github.com/go-gitea/gitea/pull/37233
https://github.com/go-gitea/gitea/releases/tag/v1.26.0
https://github.com/go-gitea/gitea/security/advisories/GHSA-9cpj-qc93-vw8v
https://github.com/go-gitea/gitea/security/advisories/GHSA-9cpj-qc93-vw8v

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